Public bug reported:
I was rebooting my laptop and it offered to install updates in the
process. I agreed. When it came back, I was presented with a terminal
login, not graphical. I installed Ubuntu 18.04 from scratch through a
flash drive.
Here is the relevant log from apt/history.log
```
Start-Date: 2018-08-23 15:11:56
Commandline: packagekit role='update-packages'
Install: policykit-1-gnome:amd64 (0.105-6ubuntu2, automatic)
Upgrade: gnome-control-center-data:amd64 (1:3.28.2-0ubuntu0.18.04.1,
1:3.28.2-0ubuntu0.18.04.2), gnome-control-center:amd64
(1:3.28.2-0ubuntu0.18.04.1, 1:3.28.2-0ubuntu0.18.04.2),
gnome-software-plugin-snap:amd64 (3.28.1-0ubuntu4.18.04.1,
3.28.1-0ubuntu4.18.04.2), grub-common:amd64 (2.02-2ubuntu8.2, 2.02-2ubuntu8.3),
gnome-software:amd64 (3.28.1-0ubuntu4.18.04.1, 3.28.1-0ubuntu4.18.04.2),
grub2-common:amd64 (2.02-2ubuntu8.2, 2.02-2ubuntu8.3), grub-efi-amd64-bin:amd64
(2.02-2ubuntu8.2, 2.02-2ubuntu8.3), ubuntu-software:amd64
(3.28.1-0ubuntu4.18.04.1, 3.28.1-0ubuntu4.18.04.2), gnome-shell-common:amd64
(3.28.2-0ubuntu0.18.04.1, 3.28.3-0ubuntu0.18.04.2), grub-efi-amd64:amd64
(2.02-2ubuntu8.2, 2.02-2ubuntu8.3), gnome-control-center-faces:amd64
(1:3.28.2-0ubuntu0.18.04.1, 1:3.28.2-0ubuntu0.18.04.2),
grub-efi-amd64-signed:amd64 (1.93.3+2.02-2ubuntu8.2, 1.93.4+2.02-2ubuntu8.3),
gnome-software-common:amd64 (3.28.1-0ubuntu4.18.04.1, 3.28.1-0ubuntu4.18.04.2),
gnome-shell-extension-ubuntu-dock:amd64 (0.9.1, 0.9.1ubuntu18.04.1)
Remove: ubuntu-session:amd64 (3.28.1-0ubuntu3), ubuntu-desktop:amd64 (1.417),
gdm3:amd64 (3.28.2-0ubuntu1.4), gnome-shell:amd64 (3.28.2-0ubuntu0.18.04.1)
End-Date: 2018-08-23 15:12:11
```
This breaks the symlink /etc/systemd/system/display-manager.service
which points to /lib/systemd/system/gdm3.service which is provided by
the gdm3 package. Reinstalling gdm3 solves the problem.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gdm3 3.28.2-0ubuntu1.4
ProcVersionSignature: Ubuntu 4.15.0-33.36-generic 4.15.18
Uname: Linux 4.15.0-33-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Thu Aug 23 15:36:15 2018
EcryptfsInUse: Yes
InstallationDate: Installed on 2018-04-30 (114 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: gdm3
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: gdm3 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug bionic
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Desktop Bugs, which is subscribed to gdm3 in Ubuntu.
https://bugs.launchpad.net/bugs/1788690
Title:
Display manager can't start because gdm3 is uninstalled
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